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/* valacreationmethod.vala
*
* Copyright (C) 2007-2010 Jürg Billeter
* Copyright (C) 2007-2008 Raffaele Sandrini
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Raffaele Sandrini <raffaele@sandrini.ch>
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a type creation method.
*/
public class Vala.CreationMethod : Method {
/**
* Specifies the name of the type this creation method belongs to.
*/
public string class_name { get; set; }
/**
* Specifies whether this constructor chains up to a base
* constructor or a different constructor of the same class.
*/
public bool chain_up { get; set; }
/**
* Creates a new method.
*
* @param name method name
* @param source_reference reference to source code
* @return newly created method
*/
public CreationMethod (string? class_name, string? name, SourceReference? source_reference = null, Comment? comment = null) {
base (name, new VoidType (), source_reference, comment);
this.class_name = class_name;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_creation_method (this);
}
public override void accept_children (CodeVisitor visitor) {
foreach (Parameter param in get_parameters()) {
param.accept (visitor);
}
if (error_types != null) {
foreach (DataType error_type in error_types) {
error_type.accept (visitor);
}
}
foreach (Expression precondition in get_preconditions ()) {
precondition.accept (visitor);
}
foreach (Expression postcondition in get_postconditions ()) {
postcondition.accept (visitor);
}
if (body != null) {
body.accept (visitor);
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
if (class_name != null && class_name != parent_symbol.name) {
// class_name is null for constructors generated by GIdlParser
Report.error (source_reference, "missing return type in method `%s.%s´", context.analyzer.current_symbol.get_full_name (), class_name);
error = true;
return false;
}
if (this_parameter != null) {
this_parameter.check (context);
}
if (coroutine && !external_package && !context.has_package ("gio-2.0")) {
error = true;
Report.error (source_reference, "gio-2.0 package required for async constructors");
return false;
}
var old_source_file = context.analyzer.current_source_file;
var old_symbol = context.analyzer.current_symbol;
if (source_reference != null) {
context.analyzer.current_source_file = source_reference.file;
}
context.analyzer.current_symbol = this;
int i = 0;
foreach (Parameter param in get_parameters()) {
if (!param.check (context)) {
error = true;
}
if (i == 0 && param.ellipsis && body != null) {
error = true;
Report.error (param.source_reference, "Named parameter required before `...'");
}
i++;
// Add local variable to provide access to params arrays which will be constructed out of the given va-args
if (param.params_array && body != null) {
if (params_array_var != null) {
error = true;
Report.error (param.source_reference, "Only one params-array parameter is allowed");
continue;
}
if (!context.experimental) {
Report.warning (param.source_reference, "Support of params-arrays is experimental");
}
var type = (ArrayType) param.variable_type.copy ();
type.element_type.value_owned = type.value_owned;
type.value_owned = true;
if (type.element_type.is_real_struct_type () && !type.element_type.nullable) {
error = true;
Report.error (param.source_reference, "Only nullable struct elements are supported in params-array");
}
if (type.length != null) {
error = true;
Report.error (param.source_reference, "Passing length to params-array is not supported yet");
}
params_array_var = new LocalVariable (type, param.name, null, param.source_reference);
body.insert_statement (0, new DeclarationStatement (params_array_var, param.source_reference));
}
}
if (error_types != null) {
foreach (DataType error_type in error_types) {
error_type.check (context);
// check whether error type is at least as accessible as the creation method
if (!error_type.is_accessible (this)) {
error = true;
Report.error (source_reference, "error type `%s' is less accessible than creation method `%s'", error_type.to_string (), get_full_name ());
return false;
}
}
}
foreach (Expression precondition in get_preconditions ()) {
precondition.check (context);
}
foreach (Expression postcondition in get_postconditions ()) {
postcondition.check (context);
}
if (body != null) {
body.check (context);
unowned Class? cl = parent_symbol as Class;
// ensure we chain up to base constructor
if (!chain_up && cl != null && cl.base_class != null) {
if (context.profile == Profile.GOBJECT
&& cl.base_class.default_construction_method != null
&& !cl.base_class.default_construction_method.has_construct_function) {
// directly chain up to Object
var old_insert_block = context.analyzer.insert_block;
context.analyzer.current_symbol = body;
context.analyzer.insert_block = body;
var stmt = new ExpressionStatement (new MethodCall (new MemberAccess (new MemberAccess.simple ("GLib", source_reference), "Object", source_reference), source_reference), source_reference);
body.insert_statement (0, stmt);
stmt.check (context);
context.analyzer.current_symbol = this;
context.analyzer.insert_block = old_insert_block;
} else if (cl.base_class.default_construction_method == null
|| cl.base_class.default_construction_method.access == SymbolAccessibility.PRIVATE) {
Report.error (source_reference, "unable to chain up to private base constructor");
} else if (cl.base_class.default_construction_method.get_required_arguments () > 0) {
Report.error (source_reference, "unable to chain up to base constructor requiring arguments");
} else {
var old_insert_block = context.analyzer.insert_block;
context.analyzer.current_symbol = body;
context.analyzer.insert_block = body;
var base_call = new MethodCall (new BaseAccess (source_reference), source_reference);
if (coroutine && cl.base_class.default_construction_method.coroutine) {
base_call.is_yield_expression = true;
}
var stmt = new ExpressionStatement (base_call, source_reference);
body.insert_statement (0, stmt);
stmt.check (context);
context.analyzer.current_symbol = this;
context.analyzer.insert_block = old_insert_block;
}
}
}
context.analyzer.current_source_file = old_source_file;
context.analyzer.current_symbol = old_symbol;
// check that all errors that can be thrown in the method body are declared
if (body != null && !body.error) {
var body_errors = new ArrayList<DataType> ();
body.get_error_types (body_errors);
foreach (DataType body_error_type in body_errors) {
bool can_propagate_error = false;
if (error_types != null) {
foreach (DataType method_error_type in error_types) {
if (body_error_type.compatible (method_error_type)) {
can_propagate_error = true;
}
}
}
if (!can_propagate_error && !((ErrorType) body_error_type).dynamic_error) {
Report.warning (body_error_type.source_reference, "unhandled error `%s'", body_error_type.to_string());
}
}
}
return !error;
}
}
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